Volume (14), Issue (1), Year (2026), Pages (92-106)

DOI:10.52113/3/eng/mjet/2026-14-01-/92-106

Research Article By:

Huda Ajel Jihad

Corresponding author E-mail:aa5680084@gmail.com

ABSTRACT

Earth roads are among the oldest roads widely used by humans in rural or desert areas with low traffic density. These roads are usually weak and unable to resist the heavy loads applied to them. Therefore, this research aims to study the possibility of using soil additives to stabilize these roads and increase their ability to resist repetitive loads, and thus enhance the rutting resistance. A series of laboratory tests is conducted on the soil, including Compaction tests, California Bearing Ratio (CBR) tests, and Wheel Tracking tests, before and after the addition of stabilizing agents. Various amounts of Cutback asphalt, Emulsified asphalt, SBR polymer and Cement are tried. Compaction and CBR tests revealed optimum additive percentages of (4%) for cutback asphalt, (2%) of emulsified asphalt, (2%) of SBR, and (7.5%) of cement, by weight of the dry sample. The obtained bulk CBR-values for the (cutback asphalt, emulsified asphalt, SBR, and cement)-stabilized soil are (4.6, 1.6, 5.7, and 11.2) times that of the natural soil, respectively. Except for cement, the added agents have adverse effects on the original soil behavior upon soaking. Rutting is evaluated via the wheel tracking test, where bulk and soaked samples are tested at temperatures of (40°C) and (60°C). The results showed that using the cutback and emulsified asphalt did not improve the soil rutting resistance. Where (SBR) is used, the treated soil showed high resistance to permanent deformation, with rut depth values of (5 mm) and (3 mm) under (5000 cycles) of load application and at (40°C) and (60°C), respectively. The soaked sample is collapsed during the test. The (7.5%) cement stabilized soil exhibited very high effectiveness in resisting rutting under bulk and soaked conditions, where the rut depth equals (1 mm) at (10000 cycles) of load application for both temperature values.

Keywords:

Earth roads, Rutting, Stabilization, Cement, SBR Polymer.

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